Compatibility Issues Like Typing Delay&Repeat Keys

If you encounter issues like key malfunctions, sticking, or typing delays after connecting the keyboard and mouse to the KVM switch, please follow the troubleshooting steps below. For ongoing assistance, contact TESmart Customer Service through the chat window or email. We are always ready to provide after-sales support.

Applicable product model: All of the KVM switches, for example

HKS202-E23 (Previously HKS0402A1U)/HDK202-E23 (Previously HDK0402A1U)/
HKS202-P23 (Previously HKS0202A2U)/HKS402-P23 (Previously HKS0402A2U)/
HKV202-E23 (Previously HKV0402A1U)/HKS802-E23 (Previously HKS0802A1U/
DKS802-E23 (Previously PKS0802A10)/HKS0403A1U etc.

This article includes the following topics:

Connect the keyboard and mouse to the USB 2.0/3.0 port of the KVM switch to check if they can function properly.

The USB 2.0/3.0 ports lack dedicated chips, so connecting the keyboard and mouse to these ports essentially mirrors a direct connection to the computer. This minimizes compatibility issues between the keyboard, mouse, and the KVM switch. If the keyboard and mouse work properly when connected to the USB 2.0/3.0 ports, it likely indicates compatibility issues with our product. We recommend contacting customer service for resolution and providing your keyboard and mouse models.

If the keyboard and mouse still do not function when connected to the USB 2.0/3.0 port, please proceed to the next troubleshooting step.

Consider turning off the control software that comes with your keyboard and mouse.

Some keyboards and mice have special software for customization and setup, but this software can sometimes create compatibility conflicts with KVM switches. After saving any necessary settings, try closing the control software to see if the problem is resolved. If none of the above steps solve the problem, you can contact us through the chat window at the bottom right or by submitting feedback. Our dedicated team of professionals is ready to help and provide after-sales support.

Please confirm whether the length of the USB cable connected between the computer and the KVM is within 2 meters.

If the length exceeds 2 meters, please replace it with a new USB cable that meets the length, requirements to ensure the normal transmission of USB signals.

Check if your KVM switch supports turning on keyboard and mouse passthrough mode, please note that this feature is usually found in older products, while newer products have it enabled by default.

Note that the following models do not support the pass-through mode: HKS0201A10, HKS0201A20, HKS0201A1U, HKS0201B1U, HKS0401A30, HKS0401A1U, HKS0401B1U, HKS0801A1U, HKS0801A30, HKS1601A10. All other KVM switches should support the pass-through mode.

1. For products that DO NOT support pass-through mode, there are three solutions:

  • Replace your keyboard and mouse with a basic wired one.
  • Connect the keyboard and mouse to the USB 2.0/3.0 port of the KVM switch, but note that the hotkey function will be disabled.
  • Consider purchasing a KVM switch that supports keyboard and mouse pass-through mode.You can contact us through the chat window at the bottom right. We would be happy to provide you with a discount.

2. For KVM switches that support pass-through mode, you have three options:

Check if the keyboard and mouse pass-through mode is enabled on the KVM switch. You can determine this by observing the mode light and listening to the buzzer.

  • For KVM switches with mode indicators, check if the "Mode Indicator" on the front panel is illuminated. If it is lit, the keyboard and mouse pass-through mode is enabled. If the light is not on, you can try to use the following key combination to enable keyboard-mouse passthrough mode: [Scroll Lock] --> [Scroll Lock] --> F2 or [Right-Ctrl] --> [Right-Ctrl] - -> F2.
  • For KVM switches without mode indicators, you can try the following hotkey combination: [Scroll Lock] --> [Scroll Lock] --> F3 or [Right Ctrl] --> [Right Ctrl] --> F3. If you hear two beeps from the buzzer, it indicates that the pass-through mode is enabled. If you hear one beep, it means the pass-through mode is disabled.

  • If your KVM switch doesn't have a mode indicator or beep sounds even after using the hotkey, there's no need to worry. This indicates that you may have the latest version of the KVM switch, which has a built-in keyboard and mouse pass-through mode. In this case, the hotkey detection method is not applicable. The keyboard and mouse pass-through mode is always enabled by default on your KVM switch.

If all of the steps above cannot help you locate and resolve the problem, please contact TESmart Customer Support for further assistance. Briefly mention the steps that you’ve already tried for a faster solution.


Was this article helpful?
4 out of 10 found this helpful



Please sign in to leave a comment.

Have more questions?
Submit a request
Share it, if you like it.